Comparison of high surface Pt/C catalysts by cyclic voltammetry

Pozio, Alfonso; Francesco, M. De; Cemmi, Alessia; Cardellini, F.; Giorgi, L.

doi:10.1016/s0378-7753(01)00921-1

Cited by 889 publications

(502 citation statements)

References 13 publications

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“…XRD patterns for the example of 60 wt% Pt/C catalyst loadings on the different supports are shown. Scherrer's formula [29,30] was used to calculate the average Pt crystallite size (d Pt ) from the Pt (220) peak, which is also listed in Table 1. For CV studies, humidified nitrogen at 100 sccm was fed to the cathode about 10 min to remove the oxygen, then 2 sccm of distilled water was fed to the cathode as a working electrode.…”

Section: Effect Of the N/c Ratio For Different Carbon Supports On Thementioning

confidence: 99%

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The Influence of Pt Loading, Support and Nafion Content on the Performance of Direct Methanol Fuel Cells: Examined on the Example of the Cathode

et al. 2011

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Nano‐sized Pt colloids were prepared using the polyol method and supported on Ketjen black EC 600J (KB), Vulcan XC‐72 (VC) and high surface area graphite 300 (HG). The effects of the Nafion ionomer content, and the Pt loading of the cathode catalyst layer as well as the Pt loading on the support on the performance of direct methanol fuel cells (DMFCs), were studied. The membrane electrode assemblies (MEAs) were analysed using current–voltage curves, cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and adsorbed CO stripping voltammetry. Optimum Nafion to carbon (N/C) ratios (N/C being defined as the weight ratio of the Nafion ionomer to the carbon) were determined. The optimum N/C ratios were found to depend on the support as follows, 1.4, 0.7 and 0.5 for Pt/KB, Pt/VC and Pt/HG, respectively and to be independent of the Pt/C loading range of 20–80 wt% tested in this work. The highest DMFC performances, as well as the highest electrochemical active surface areas, and improved gas diffusivities, were achieved using these ratios. For the catalysts prepared in this work, the average Pt crystallite size was found to decrease with increasing surface area of the support for a particular Pt loading. MEAs made using KB as support and the optimal N/C ratio of 1.4 showed the best performances, i.e. higher than the VC and HG supports for any N/C ratio. The highest DMFC performance was observed using 60 wt% Pt on KB cathode electrodes of 1 mg Pt cm–2 loading and an N/C value of 1.4. For all three supports studied, the 60 wt% Pt on carbon loading resulted in the best DMFC performance. This may be linked to the Pt particle size and catalyst preparation method used in this work. In comparison to literature results, high DMFC performances were achieved using relatively ‘low' Pt and Ru loadings. For example, a maximum power density of >100 mW cm–2 at 60 °C was observed using a 1 mg Pt cm–2 cathode loading and a 2 mg PtRu cm–2 anode loading.

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Section: Effect Of the N/c Ratio For Different Carbon Supports On Thementioning

confidence: 99%

“…To estimate the Pt/C catalyst utilization, the EASA values are divided by the theoretical Pt surface area, and multiplied by 100. Assuming spherical Pt particles and no agglomeration, a rough estimate of the theoretical surface area is obtained using the following equation [29].…”

Section: More Detailed Studies Of the Impact Of The N/c Ratiomentioning

confidence: 99%

The Influence of Pt Loading, Support and Nafion Content on the Performance of Direct Methanol Fuel Cells: Examined on the Example of the Cathode

et al. 2011

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“…Adsorbed CO can be stripped from the Pt surface at potentials in the range 0.7-0.9 V vs. RHE. The charge corresponding to one monolayer of adsorbed CO is equal to 0.484 mC cm −2 [47,48]. Hence, by measuring the charge under the stripping peak, after subtraction of the background currents, the electrochemically active area (EAS) of platinum can be obtained using the formula:…”

Section: Resultsmentioning

confidence: 99%

“…Active surface area and, indirectly, loading of platinum nanoparticles was probed using CO-stripping voltammetric approach [47,48]. Prior to the diagnostic electrochemical measurements, argon was purged through 0.5 mol dm −3 sulfuric acid electrolyte for 30 min.…”

Section: Methodsmentioning

confidence: 99%

Electrocatalytic properties of platinum nanocenters electrogenerated at ultra-trace levels within zeolitic phosphododecatungstate cesium salt matrices

Kolary-Zurowska

Zurowski

Dsoke

et al. 2014

J Solid State Electrochem

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A unique preparation method of obtaining stable composite film (with ultra-low platinum content) highly active towards oxygen reduction and hydrogen oxidation is presented here. The matrix for platinum centers consists of highsurface-area zeoli te-t ype aci dic salt of cesium phosphododecatungstate (Cs 2.5 H 0.5 PW 12 O 40 ) admixed with carbon (Vulcan XC-72) carriers. Platinum nanoparticles were deposited on the working electrode modified with matrix via corrosion of platinum counter electrode during cyclic voltammetry experiment conducted in acid electrolyte containing chloride ions. The results obtained from rotating disk voltammetry revealed that the composite film containing Pt nanoparticles at very low loadings (on the level of 2-5 μg cm −2 ) demonstrated remarkable electrocatalytic activity towards both oxygen reduction and hydrogen oxidation, particularly, when compared to the performance of the Cs 2.5 H 0.5 PW 12 O 40 -free system (i.e., containing only Vulcan support) prepared and examined under analogous conditions. The phenomenon should be primarily ascribed to the mesoporous nature of the matrix enabling immobilization and stabilization of small catalytic nanoparticles (1-2 nm diameters) inside the pores as well as to high surface acidity of the polyoxometalate-based salt providing proton-rich environment at the electrocatalytic interface.

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“…The CV curves of Pt/G, PtCo/G and PtCo/MWNTs are presented in Figure 6(a). ECSA values can be calculated from the coulombic charge for the hydrogen adsorption and desorption (Q H ) in the negative-going potential scan (0 to 0.2 V vs SCE) according to the following formula [56]:…”

Section: Resultsmentioning

confidence: 99%

PtCo alloy nanoparticles supported on graphene nanosheets with high performance for methanol oxidation

2012

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PtCo alloy nanoparticles are deposited onto graphene sheets through a facile and reproducible hydrothermal method. During the hydrothermal reaction, the reduction of graphene oxide and PtCo alloy nanoparticles loading can be achieved. X-ray diffraction (XRD) analyses reveal a good crystallinity of the supported Pt nanoparticles in the composites and the formation of PtCo alloy. X-ray photoelectron spectra (XPS) results depict that Pt mainly exists in the metallic form, while much of the cobalt is oxidized. Transmission electron microscope (TEM) observations show that the PtCo alloy nanoparticles are uniformly dispersed on graphene nanosheets compared with multiwalled carbon nanotubes (MWNTs). This PtCo-graphene composite exhibits excellent electrocatalytic activity and high poison tolerance toward poisoning species for methanol oxidation reaction, far outperforming the Pt-graphene or PtCo-MWNTs composites with the same feeding ratio of Pt/carbon. graphene, PtCo alloy nanoparticles, electrocatalyst, methanol oxidation, fuel cells Citation:Huang H J, Sun D P, Wang X. PtCo alloy nanoparticles supported on graphene nanosheets with high performance for methanol oxidation.

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Comparison of high surface Pt/C catalysts by cyclic voltammetry

Cited by 889 publications

References 13 publications

The Influence of Pt Loading, Support and Nafion Content on the Performance of Direct Methanol Fuel Cells: Examined on the Example of the Cathode

The Influence of Pt Loading, Support and Nafion Content on the Performance of Direct Methanol Fuel Cells: Examined on the Example of the Cathode

Electrocatalytic properties of platinum nanocenters electrogenerated at ultra-trace levels within zeolitic phosphododecatungstate cesium salt matrices

PtCo alloy nanoparticles supported on graphene nanosheets with high performance for methanol oxidation

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